当我尝试使用kyronet（用于网络）时，我收到此错误。似乎代码中没有任何问题，我将其导出正确。这是日志：
[TextRPG] Starting TextRPG server version: 1.0
[TextRPG] Please ignore any messages by kyronet. This is just the API I used for networking.
[TextRPG] Getting server directory...
[TextRPG] Checking for server properties...
[TextRPG] Properties exists, injecting..
Exception in thread "main" java.lang.NoClassDefFoundError: com/esotericsoftware/kryo/io/Output
at com.esotericsoftware.kryonet.Server.<init>(Server.java:109)
at com.esotericsoftware.kryonet.Server.<init>(Server.java:91)
at dsboy08.TextRPGServer.ServerStartMain.<init>(ServerStartMain.java:34)
at dsboy08.TextRPGServer.ServerStartMain.main(ServerStartMain.java:69)
Caused by: java.lang.ClassNotFoundException:com.esotericsoftware.kryo.io.Output
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 4 more
以下是主类中的代码：
package dsboy08.TextRPGServer;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Scanner;
import javax.swing.JOptionPane;
import com.esotericsoftware.kryonet.Connection;
import com.esotericsoftware.kryonet.Listener;
import com.esotericsoftware.kryonet.Server;
import com.esotericsoftware.yamlbeans.YamlException;
import com.esotericsoftware.yamlbeans.YamlReader;
import com.esotericsoftware.yamlbeans.YamlWriter;
import dsboy08.TextRPGServer.ConfigVars.ServerProperties;
import dsboy08.TextRPGServer.Packets.Packet;
public class ServerStartMain {
/*
* Variables & Declaration
*/
static double version = 1.0;
static String currentJarPath;
Server server = new Server();
public int ServerPort;
public int MaxPlayers;
public String ServerName;
public String MOTD;
public boolean serverEnabled = false;
/*
* Server Start Sequence
*/
public static void main(String[] args) {
System.out.println("[TextRPG] Starting TextRPG server version: "+version);
System.out.println("[TextRPG] Please ignore any messages by kyronet. This is just the API I used for networking.");
System.out.println("[TextRPG] Getting server directory...");
//Get current jar path
final Class<?> referenceClass = ServerStartMain.class;
final URL url =
referenceClass.getProtectionDomain().getCodeSource().getLocation();
try{
final String jarPath = new File(url.toURI()).getParentFile().toString();
currentJarPath = jarPath;
} catch(final URISyntaxException e){
JOptionPane.showMessageDialog(null, "A critical error happended while trying to get the current directory of the jar. Please report this to @3dsboy08.");
System.exit(-1);
}
System.out.println("[TextRPG] Checking for server properties...");
File f = new File(currentJarPath + "/properties.yml");
if(f.exists() && !f.isDirectory()) {
System.out.println("[TextRPG] Properties exists, injecting..");
//Server config exists. Get it for future reference
ServerProperties config;
try {
YamlReader reader = new YamlReader(new FileReader(currentJarPath+"/properties.yml"));
config = reader.read(ServerProperties.class);
new ServerStartMain().readYML(config);
System.out.println("[TextRPG] Binding to IP: "+getIpAddress());
} catch (YamlException | FileNotFoundException e) {
JOptionPane.showMessageDialog(null, "A critical error happended while trying to read the servers config file. Please report this to @3dsboy08.");
System.exit(-1);
}
}else{
System.out.println("[TextRPG] File properties.yml doesn't exist, creating it.");
try {
f.createNewFile();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "A critcal error happended while trying to create the servers properties. Please report this to @3dsboy08.");
System.exit(-1);
}
serverSetupWizard();
//Server setup wizard is done. Get the output.
try {
YamlReader reader = new YamlReader(new FileReader(currentJarPath+"/properties.yml"));
ServerProperties config = reader.read(ServerProperties.class);
new ServerStartMain().readYML(config);
} catch (FileNotFoundException | YamlException e) {
JOptionPane.showMessageDialog(null, "A critical error happended while trying to read the servers config file. Please report this to @3dsboy08.");
System.exit(-1);
}
}
}
/*
* Server Setup Wizard.
*/
public static void serverSetupWizard(){
boolean maxPlayersInvalid = true;
boolean portInvalid = true;
System.out.println("[TextRPG] Starting server setup wizard.");
ServerProperties config = new ServerProperties();
while(maxPlayersInvalid == true){
String MaxPlayers = JOptionPane.showInputDialog(null, "Please enter in a maximum amount of players for the server.");
try{
config.MaxPlayers = Integer.parseInt(MaxPlayers);
maxPlayersInvalid = false;
break;
}catch(NumberFormatException e){
JOptionPane.showMessageDialog(null, "Error: Invalid amount of players.");
}
}
config.MOTD = JOptionPane.showInputDialog(null, "Please enter in a MOTD for your server.");
config.ServerName = JOptionPane.showInputDialog(null, "Please enter in a server name for your server.");
while(portInvalid == true){
String Port = JOptionPane.showInputDialog(null, "Please enter in a port for your server (it must be a 5-digit number).");
try{
if(!(Port.length() == 5)){
JOptionPane.showMessageDialog(null, "Error: Invalid amount of port characters (must be 5)");
}else{
config.ServerPort = Integer.parseInt(Port);
portInvalid = false;
break;
}
}catch(NumberFormatException e){
JOptionPane.showMessageDialog(null, "Error: Invalid port number.");
}
}
try {
YamlWriter writer = new YamlWriter(new FileWriter(currentJarPath+"/properties.yml"));
writer.write(config);
writer.close();
System.out.println("[TextRPG] Successfully created server properties. Please restart the server.");
System.exit(-1);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "A critical error happended while trying to write to the server properties. Please report this to @3dsboy08.");
System.exit(-1);
}
}
/*
* Read YML
*/
public void readYML(ServerProperties config){
MOTD = config.MOTD;
ServerName = config.ServerName;
ServerPort = config.ServerPort;
MaxPlayers = config.MaxPlayers;
}
/*
* Start Server
*/
public void startServer(){
System.out.println("[TextRPG] Binding packets...");
server.getKryo().register(Packet.class);
System.out.println("[TextRPG] Done!");
server.start();
try {
server.bind(ServerPort);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "A critical error happended while trying to bind to a server port (server in use). Please stop the server and try agian.");
}
server.addListener(new Listener(){
public void received (Connection connection, Object object){
if(object instanceof Packet){
}
}
});
while(serverEnabled == true){
Scanner scanner = new Scanner(System.in);
String commandNotConverted = scanner.nextLine();
String[] command = commandNotConverted.split(" ");
if(command[0].equalsIgnoreCase("stop")){
serverEnabled = false;
stopServer();
break;
}
}
}
/*
* Admin commands
*/
public void stopServer(){
//TODO: Send server closing packet to all players
System.out.println("[TextRPG] Server closing!");
server.close();
System.exit(0);
}
/*
* Get IP Address
*/
public static String getIpAddress()
{
URL myIP;
try {
myIP = new URL("http://api.externalip.net/ip/");
BufferedReader in = new BufferedReader(
new InputStreamReader(myIP.openStream())
);
return in.readLine();
} catch (Exception e)
{
try
{
myIP = new URL("http://myip.dnsomatic.com/");
BufferedReader in = new BufferedReader(
new InputStreamReader(myIP.openStream())
);
return in.readLine();
} catch (Exception e1)
{
try {
myIP = new URL("http://icanhazip.com/");
BufferedReader in = new BufferedReader(
new InputStreamReader(myIP.openStream())
);
return in.readLine();
} catch (Exception e2) {
e2.printStackTrace();
}
}
}
return null;
}
}
有什么方法可以解决这个问题吗？如果您有答案，请回复。
编辑：我已经回答了我的问题，并没有重复。问题是我忘了将我的库导出到jar文件。很抱歉给您带来不便。答案 0 :(得分：0)
我已经解决了问题。我忘了将所需的库打包到我的jar文件中以导出。对不起，我浪费了人们的时间。虽然这是一个答案，但请记住导出您将要使用的库。